Philadelphia Mayor Michael Nutter

An Amtrak passenger train with more than 200 passengers on board derailed in north Philadelphia on Tuesday night, killing at least five people and injuring more than 50 others, several of them critically, authorities said.

An Amtrak passenger train with more than 200 passengers on board derailed in north Philadelphia on Tuesday night, killing at least five people and injuring more than 50 others, several of them critically, authorities said.